Bone vampires

Bone vampires are a species of alien creature that was hunted to near-extinction. Their homeworld is Doohan 6. Thet get their name from their way of feeding themselves: by sucking the skeleton out of their victims. They reproduce asexually. By 3011, they were all extinct, with the exception of one egg that was hatched by Fry. When the Planet Expresscrew returned it to its homeworld, the populace feared for their livestock, and set to hunt it down. When it is revealed that the people had excessive livestock to slaughter, they spared the creature because it can bring back the entire species to help kill the extra livestock.

They are capable of utilizing acid as a form of weapon (they have acidic saliva and urine).

They are similar to the legendary cryptid, the Chupacabra from Mexico; they look alike, both only attack at night, and they both attack, kill and feed on livestock by sucking out their blood (or, in this case, bones).